Preface. Cryogenic Solar Absolute Radiometer -- CSAR. A Review of the Nimbus-y ERB Solar Dataset. Long-Term Variations in Total Solar Irradiance. Solar Total Irradiance Variability from SOVA 2 on Board EURECA. The Periodicity of Solar Activity Cycles. Maximum and Minimum Temperatures at Armagh Observatory 1844--1992, and the Length of the Sunspot Cycle. Photometer DIFOS' for the Study of Solar Brightness Variations. The Brightness of the Solar Disk...